AC (Alternating Current): A type of current where the polarity is perpetually reversing, causing the directional flow in a circuit to reverse at regular intervals.
ACCA: Air Conditioning Contractors of America
Acoustical: Relating to sound, the science of sound, or a sense of hearing.
AFUE (Annual Fuel Utilization Efficiency): A measurement used to rate furnace efficiencies by dividing the ratio of heat output by heat input.
AGA: American Gas Association, Inc.
Air Cleaner: A device that removes allergens, pollutants and other undesirable particles from air that is heated or cooled.
Air Conditioner: A device that changes humidity levels, temperature or quality of air.
Air Filtration System: A device that removes allergens, pollutants and other undesirable particles from air that is heated or cooled.
Airflow Volume: Measured in cubic feet per minute (cfm), this is the amount of air circulated in a space.
Air Handler: Parts of a system including the fan-blower, filter and housing.
AHRI: Air Conditioning, Heating and Refrigeration Institute
Allergen: A substance that causes an allergic reaction. It includes dust, pollen, pet hair and dander, dust mites, mildew, lint, fungus, most tobacco smoke, cooking grease and bacteria.
All-In-One or Packaged System: Packaged systems are all-in-one solutions, with most of the components for heating and/or cooling housed in a single cabinet.
ASHRAE: American Society of Heating, Refrigeration and Air Conditioning Engineers
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